What happens to the Mapper task if JobTracker stops responding suddenly due to an unknown reason?

Asked by Last Modified  

1 Answer

Learn Hadoop +3 Hadoop Testing Big Data Analytics

Follow 1
Answer

Please enter your answer

Rajendra Mahakali

Tutor

Namenode and JobTracker are SPOF (Single point of failure), If for any unknown reason the JobTracker fails, then all datanode and tasktracker will fail to send the ACK, and or heartbeat to the datanote/JobTracker. The result of both mapper or reducer will be redundant and the Namenode must be made available...
read more
Namenode and JobTracker are SPOF (Single point of failure), If for any unknown reason the JobTracker fails, then all datanode and tasktracker will fail to send the ACK, and or heartbeat to the datanote/JobTracker.The result of both mapper or reducer will be redundant and the Namenode must be made available online, so that all the job can be retriggered. read less
Comments
Dislike Bookmark

Related Questions

Do I need to learn the Java-Hibernate framework to be a Hadoop developer?
Not At All . To be Hadoop Developer , you need the knowledge of basic core Java programming along with SQL . No one will ask any question in interview on hibernate .
Pritam
0 0
6
Hello all, I have completed B.com, MBA fin & M and 5 yr working experience in SAP PLM 1 - Engineering documentation management 2 - Documentation management Please suggest me which type of training I should take for getting more knowledge, clear all concept in details, also help for getting job and cracking interview questions for SAP consultant. 1) Real time training 2) Online training 3) Local institute training 4) Certification training
Hi Priya, since you have B Com and MBA Finance better to go with SAP FICO. Whether online or classroom it doesn't make much difference. But the subject should be learned thoroughly. It will increase your...
Priya
Hello everyone, I have completed B.Com, MBA (FIN). Please suggest me which IT course suitable to my career growth. Thanks.
Its better to learn any business analytics courses.
Priya
Is there a list of the world's largest Hadoop clusters on the web?
No . As pf now Yahoo has tested with 5000 nodes . but there is no such information .
Nishant
0 0
7
What is the speculative execution in hadoop?
Speculative execution in Hadoop is a process of running duplicate tasks on different nodes to finish the job faster by using the result from the task that completes first.
Divya
0 0
5

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Related Lessons

How can you recover from a NameNode failure in Hadoop cluster?
How can you recover from a Namenode failure in Hadoop?Why is Namenode so important?Namenode is the most important Hadoop service. It contains the location of all blocks in the cluster. It maintains the...
B

Biswanath Banerjee

0 0
0
Solving the issue of Namenode not starting during Single Node Hadoop installation
On firing jps command, if you see that name node is not running during single node hadoop installation , then here are the steps to get Name Node running Problem: namenode not getting started Solution:...
B

Biswanath Banerjee

1 0
0
How to create UDF (User Defined Function) in Hive
1. User Defined Function (UDF) in Hive using Java. 2. Download hive-0.4.1.jar and add it to lib-> Buil Path -> Add jar to libraries 3. Q:Find the Cube of number passed: import org.apache.hadoop.hive.ql.exec.UDF; public...
S

Sachin Patil

0 0
0
Understanding Big Data
Introduction to Big Data This blog is about Big Data, its meaning, and applications prevalent currently in the industry.It’s an accepted fact that Big Data has taken the world by storm and has become...
M

Mymirror

0 0
0
13 Things Every Data Scientist Must Know Today
We have spent close to a decade in data science & analytics now. Over this period, We have learnt new ways of working on data sets and creating interesting stories. However, before we could succeed,...

Sv Tech Soft

0 0
0

Recommended Articles

Growth and Career Prospects in Big Data

Big data is a phrase which is used to describe a very large amount of structured (or unstructured) data. This data is so “big” that it gets problematic to be handled using conventional database techniques and software.  A Big Data Scientist is a business employee who is responsible for handling and statistically evaluating...

Read full article >

Some Popular IT Courses in Current Market

In the domain of Information Technology, there is always a lot to learn and implement. However, some technologies have a relatively higher demand than the rest of the others. So here are some popular IT courses for the present and upcoming future: Cloud Computing Cloud Computing is a computing technique which is used...

Read full article >

Why Should you Become a Data Scientist

We have already discussed why and how “Big Data” is all set to revolutionize our lives, professions and the way we communicate. Data is growing by leaps and bounds. The Walmart database handles over 2.6 petabytes of massive data from several million customer transactions every hour. Facebook database, similarly handles...

Read full article >

Learn Hadoop and Big Data

Hadoop is a framework which has been developed for organizing and analysing big chunks of data for a business. Suppose you have a file larger than your system’s storage capacity and you can’t store it. Hadoop helps in storing bigger files than what could be stored on one particular server. You can therefore store very,...

Read full article >

Find Hadoop near you
Hadoop in Hyderabad
Hadoop in Bangalore

Looking for Hadoop ?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you